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DTSTART:20240310T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240527T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240527T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/semiconduct
or-spin-qubits-quantum-networking
SUMMARY:Semiconductor spin qubits for quantum networking
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC COLLOQUIUM - AKIRA OIWA\, OSAKA UNIVERSITY\n\nQ
uantum-Nano Centre\, 200 University Ave West\, Room QNC 1501 Waterloo\,\nO
N CA N2L 3G1\n\nSemiconductor spin qubits are well recognized as a promisi
ng platform\nfor scalable fault-tolerant quantum computers (FTQCs) because
of\nrelatively long spin coherence time in solid state devices and\nhigh-
electrical tuneability of the quantum states [1]. In addition\,\nsemicondu
ctors have a great potential for applications in quantum\ncommunications b
ecause of their abilities in optical devices.\nTherefore\, especially in q
uantum repeater applications\, the\nsemiconductor spin qubits provide a ro
ute to efficiently connect qubit\nmodules or quantum computers via optical
fibers and construct global\nquantum networks\, contributing to realize s
ecure quantum\ncommunications and distributed quantum computing [2]. In th
is talk\, we\npresent the physical process enabling the quantum state conv
ersion\nfrom single photon polarization states to single electron spin sta
tes\nin gate-defined quantum dots (QDs) and its experimental demonstration
\n[3]. As recent significant achievements\, we discuss that the\nenhanceme
nt of the conversion efficiency from a single photon to a\nsingle spin in
a quantum dot using photonic nanostructures [4].\nFinally\, we present a p
erspective of high conversion efficiency\nquantum repeater operating direc
tly at a telecom wavelength based on\nsemiconductor spin qubits.\n\n[1] G.
Burkard et al.\, Rev. Mod. Phys. 95\, 025003 (2023). [2] A. Oiwa\net al.\
, J. Phys. Soc. Jpn. 86\, 011008 (2017)\; L. Gaudreau et al.\,\nSemicond.
Sci. Technol. 32\, 093001 (2017). [3] T. Fujita et al.\,\nNature commun. 1
0\, 2991 (2019)\; K. Kuroyama et al.\, Phys. Rev. B 10\,\n2991 (2019). [4]
R. Fukai et al.\, Appl. Phys. Express 14\, 125001\n(2021)\; S. Ji et al.\
, Jpn. J. Appl. Phys. 62\, SC1018 (2023).\n
DTSTAMP:20240518T040306Z
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DTSTART;TZID=America/Toronto:20240409T133000
SEQUENCE:0
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DTEND;TZID=America/Toronto:20240409T143000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/photonic-li
nks-rydberg-atom-arrays
SUMMARY:Photonic Links for Rydberg Atom Arrays
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC SPECIAL COLLOQUIUM - IVANA DIMITROVA\, HARVARD
UNIVERSITY\n\nQuantum-Nano Centre\, 200 University Ave West\, Room QNC 010
1 Waterloo\,\nON CA N2L 3G1\n\nScaling up the number of qubits available i
n experimental systems is\none of the most significant challenges in quant
um computation. A\npromising path forward is to modularize the quantum pro
cessors and\nthen connect many processors using quantum channels\, realize
d using\nphotons and optical fibers. For Rydberg atom arrays\, one of the
\nleading platforms for quantum information processing\, this could be\ndo
ne by developing an interface for photons\, such as an optical\ncavity. In
addition\, an optical cavity can be used for fast\nmid-circuit readout fo
r error detection. In this talk\, I will discuss\nrecent progress with two
types of cavities and their feasibility as a\nphotonic link. First\, we s
how coherent control of Rydberg qubits and\ntwo-atom entanglement as close
as 130um away from a nanophotonic\ncavity. Second\, we show fast high-fid
elity qubit state readout at a\nfiber Fabry Perot cavity. In addition\, a
fiber cavity also allows for\ncavity-mediated atom-atom gates\, which coul
d enable novel quantum\nnetworking capabilities. \n
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DTSTART;TZID=America/Toronto:20240402T143000
SEQUENCE:0
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DTEND;TZID=America/Toronto:20240402T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/quantum-com
putational-advantages-energy-minimization
SUMMARY:Quantum Computational Advantages in Energy Minimization
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC SPECIAL COLLOQUIUM LEO ZHOU\, CALIFORNIA INSTIT
UTE OF TECHNOLOGY\n\nQuantum-Nano Centre\, 200 University Ave West\, Room
QNC 1201 Waterloo\,\nON CA N2L 3G1\n\nFinding the minimum of the energy of
a many-body system is a\nfundamental problem in many fields. Although we
hope a quantum\ncomputer can help us solve this problem faster than classi
cal\ncomputers\, we have a very limited understanding of where a quantum\n
advantage may be found. In this talk\, I will present some recent\ntheoret
ical advances that shed light on quantum advantages in this\ndomain. First
\, I describe rigorous analyses of the Quantum Approximate\nOptimization A
lgorithm applied to minimizing energies of classical\nspin glasses. For ce
rtain families of spin glasses\, we find the QAOA\nhas a quantum advantage
over the best known classical algorithms.\nSecond\, we study the problem
of finding a local minimum of the energy\nof quantum systems. While local
minima are much easier to find than\nground states\, we show that finding
a local minimum under thermal\nperturbations is computationally hard for c
lassical computers\, but\neasy for quantum computers. These results highli
ght exciting new\ndirections in leveraging physics-inspired algorithms to
achieve\nquantum advantages in broadly useful problems.\n
DTSTAMP:20240518T040306Z
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DTSTART;TZID=America/Toronto:20240411T133000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240411T143000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/breaking-er
godicity-quantum-scars-quantum-many-body-scars
SUMMARY:Breaking ergodicity: quantum scars\, quantum many-body scars and\nr
egular eigenstates
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC SPECIAL COLLOQUIUM - CEREN B. DAG HARVARD UNIVE
RSITY\n\nQuantum-Nano Centre\, 200 University Ave West\, Room QNC 0101 Wat
erloo\,\nON CA N2L 3G1\n\nQuantum many-body scars (QMBS) consist of a few
low-entropy\neigenstates in an otherwise chaotic many-body spectrum and ca
n weakly\nbreak ergodicity resulting in robust oscillatory dynamics. The n
otion\nof QMBS follows the original single-particle scars introduced withi
n\nthe context of quantum billiards\, where scarring manifests in the form
\nof a quantum eigenstate concentrating around an underlying classical\nun
stable periodic orbit. A direct connection between these notions\nremains
an outstanding question. Here\, I will first show that a spinor\ncondensat
e\, owing to its collective interactions\, is amenable to the\ndiagnostics
of scars. We characterize this system's rich dynamics\,\nspectrum\, and p
hase space\, consisting of both regular and chaotic\nstates. The former ar
e low in entropy\, violate the Eigenstate\nThermalization Hypothesis\, and
can be traced back to integrable\neffective Hamiltonians\, whereas most o
f the latter are scarred by the\nunderlying classical unstable periodic or
bits\, while satisfying\nEigenstate Thermalization Hypothesis. I will exhi
bit evidence on how\nthe existing QMBS in the literature are akin to the r
egular states\,\nrather than the quantum scars. Then I will move on to int
roduce a\nspatially many-body model with a mean-field limit by decreasing
the\nrange of the interactions. Remarkably\, we find that unstable periodi
c\norbits affect the early-time many-body dynamics giving rise to a new\nt
ype of QMBS. I will classify the QMBS in two main classes\, discuss\ntheir
distinct properties\, and show how both QMBS states show up in\nour model
in different parameter regimes. This talk aims (i) to\nclarify the connec
tion of QMBS to quantum scars and regular\neigenstates\, and (ii) illustra
te the fundamental principle of\nclassical-quantum correspondence in a man
y-body system\, and its\ncurrent limitations.\n
DTSTAMP:20240518T040306Z
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DTSTART;TZID=America/Toronto:20240326T143000
SEQUENCE:0
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DTEND;TZID=America/Toronto:20240326T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/quantum-sig
nal-and-noise-towards-intermediate-term-quantum
SUMMARY:The (Quantum) Signal and the Noise: towards the intermediate term o
f\nquantum computation
CLASS:PUBLIC
DESCRIPTION:Summary \n\nTHE (QUANTUM) SIGNAL AND THE NOISE: TOWARDS THE INT
ERMEDIATE TERM OF\nQUANTUM COMPUTATION\n\nUniversity of Waterloo\, 200 Uni
versity Ave West QNC 0101 + ZOOM\n\nCan we compute on small quantum proces
sors? In this talk\, I explore\nthe extent to which noise presents a barri
er to this goal by quickly\ndrowning out the information in a quantum comp
utation. Noise is a\ntough adversary: we show that a large class of error
mitigation\nalgorithms -- proposals to \"undo\" the effects of quantum no
ise\nthrough mostly classical post-processing – can never scale up.\nSwi
tching gears\, we next explore the effects of non-unital noise\, a\nphysic
ally natural (yet analytically difficult) class of noise that\nincludes am
plitude-damping and photon loss. We show that it creates\neffectively shal
low circuits\, in the process displaying the strongest\nknown bound on ave
rage convergence of quantum states under such noise.\nConcluding with the
computational complexity of learning the outputs\nof small quantum process
ors\, I will set out a program for wrapping\nthese lower bounds into new d
irections to look for near-term quantum\ncomputational advantage. \n
DTSTAMP:20240518T040306Z
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BEGIN:VEVENT
UID:6648287aebe90
DTSTART;TZID=America/Toronto:20240401T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240401T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/high-capaci
ty-optical-fiber-transmission-systems-high
SUMMARY:HIGH-CAPACITY OPTICAL FIBER TRANSMISSION SYSTEMS TO HIGH-SENSITIVIT
Y\nQUANTUM DETECTION
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC COLLOQUIUM/IEEE-SSCS DISTINGUISHED LECTURE - RE
NÉ-JEAN ESSIAMBRE\,\nNOKIA/BELL LABS\n\nUniversity of Waterloo\, 200 Univ
ersity Ave W. Waterloo\, QNC 0101\n\nThe first part of this presentation w
ill provide a brief overview of\noptical technologies that enabled high-ca
pacity fiber-optic\ncommunication systems\, from single-mode fibers to fib
ers supporting\nmultiple spatial modes. A perspective on the evolution of\
nhigh-capacity systems will be discussed. The second part of the talk\nwil
l focus on power-e ciency optical detection systems. More\nspecifically\
, we will describe an experimental demonstration of a\nsystem operating at
12.5 bits/photon with optical clock transmission\nand recovery on free-ru
nning transmitters and receivers.\n\nAbout René-Jean Essiambre Dr. Essiam
bre worked in the areas of fiber\nlasers\, nonlinear fiber optics\, advanc
ed modulation formats\,\nspace-division multiplexing\, information theory\
, and\nhigh-photon-e ciency systems. He participated in the design of\nc
ommercial fiber-optic communication systems where several of his\ninventio
ns were implemented. He has given over 150 invited talks and\nhelped prepa
re and delivered the 2018 Physics Nobel Prize Lecture on\nbehalf of Arthur
Ashkin. He served on or chaired many conference\ncommittees\, including O
FC\, ECOC\, CLEO\, and IPC. He received the 2005\nEngineering Excellence A
ward from OPTICA and is a fellow of the IEEE\,\nOPTICA\, IAS-TUM\, and Bel
l Labs. He was President of the IEEE Photonics\nSociety (2022-2023) and is
currently the Past-President (2024-2025).\n
DTSTAMP:20240518T040306Z
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DTSTART;TZID=America/Toronto:20240325T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240325T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/fundamental
-physics-quantum-limits-measurement
SUMMARY:Fundamental physics at the quantum limits of measurement
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC COLLOQUIUM - DANIEL CARNEY\, BERKELEY LABS\n\n2
00 University Ave. W. Waterloo Ontario\, QNC 0101\n\nThe search for new fu
ndamental physics -- particles\, fields\, new\nobjects in the sky\, etc --
requires a relentless supply of more and\nmore sensitive detection modali
ties. Experiments looking for new\nphysics are starting to regularly encou
nter noise sources generated by\nthe quantum mechanics of measurement itse
lf. This noise now needs to\nbe engineered away. The search for gravitatio
nal waves with LIGO\, and\ntheir recent use of squeezed light\, provides p
erhaps the most famous\nexample. More broadly\, searches for various dark
matter candidates\,\nprecision nuclear physics\, and even tests of the qua
ntization of\ngravity are all now working within this quantum-limited regi
me of\nmeasurement. In this talk\, I will give an overview of this set of\
nideas\, focusing on activity going on now and what can plausibly be\nachi
eved within the next decade or so.\n
DTSTAMP:20240518T040306Z
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BEGIN:VEVENT
UID:6648287aecc11
DTSTART;TZID=America/Toronto:20240311T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240311T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/quantum-err
or-correcting-codes-are-far-classical
SUMMARY:Quantum error-correcting codes are far from classical: a quantitati
ve\nexamination
CLASS:PUBLIC
DESCRIPTION:Summary \n\nSPECIAL COLLOQUIUM - ZHI LI\, PERIMETER INSTITUTE\n
\nUniversity of Waterloo 200 University Ave. W Waterloo QNC 0101\n\nQuantu
m error-correcting codes play a pivotal role in enabling\nfault-tolerant q
uantum computation. These codes protect quantum\ninformation through intri
cately designed redundancies that encode the\ninformation in a global mann
er. Unlike classical objects\, in a quantum\nerror-correcting code\, the k
nowledge of individual subregions\, even\nwhen combined\, reveals nothing
about the overall state.\n\nIn this talk\, we explore the quantification o
f how far quantum\nerror-correcting code are from classical states. We exa
mine this\nquestion from three different perspectives: circuit complexity
(the\nmimimal number of circuit depth needed to prepare a quantum state)\,
\nexpansion number (the minimal number of terms needed to expand the\nwave
function)\, and a quantity we termed product overlap\, which\ncharacterize
s the maximal overlap between a given state and any\nproduct state. We wil
l demonstrate why any quantum error-correcting\ncode states must exhibit e
xponentially small product overlap\, and how\nit implies lower bounds for
the circuit complexity and the expansion\nnumber.\n
DTSTAMP:20240518T040306Z
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UID:6648287aed289
DTSTART;TZID=America/Toronto:20240304T133000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240304T143000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/building-qu
antum-networks-solid-state-defects-and-rydberg
SUMMARY:Building quantum networks: from solid-state defects and Rydberg ato
ms\nin cavities to a new scientific frontier with hybrid quantum systems.
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC SPECIAL COLLOQUIUM - AZIZA SULEYMANZADE\, HARVA
RD UNIVERSITY\n\n200 University Ave W. Waterloo ON - ZOOM only\n\nThe expe
rimental development of quantum networks marks a significant\nscientific m
ilestone\, poised to enable secure quantum communication\,\ndistributed qu
antum computing\, and entanglement-enhanced nonlocal\nsensing. In this tal
k\, I will discuss the recent advancements in the\nfield along with the ou
tstanding challenges through my work on two\ndifferent platforms: Silicon
Vacancy defects in diamond nanophotonic\ncavities and Rydberg atoms couple
d to hybrid cavities. First\, I will\npresent our recent results on distri
buting entanglement across a\ntwo-node network with on-chip solid-state de
fects in cavities which we\nbuilt at Harvard. We demonstrated high-fidelit
y entanglement between\ncommunication and memory qubits and showed long-di
stance entanglement\nover the 35 km of deployed fiber in the Cambridge/Bos
ton area. Second\,\nI will describe our work at the University of Chicago
on using Rydberg\natoms as transducers of quantum information between opti
cal and\nmicrowave photons\, with the goal of integrating Rydberg platform
s with\nsuperconducting circuits and paving the way for advanced quantum\n
network architectures. The talk will conclude with a perspective on\nthe p
otential of this hybrid platform approach in constructing quantum\nnetwork
s\, highlighting the uncharted scientific and technological\nopportunities
it could unlock.\n
DTSTAMP:20240518T040306Z
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BEGIN:VEVENT
UID:6648287aedaf6
DTSTART;TZID=America/Toronto:20240205T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240205T153000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/achieving-q
uantum-sensing-limits-noisy-environment
SUMMARY:Achieving quantum sensing limits in noisy environment
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC COLLOQUIUM - SISI ZHOU\, THE PERIMETER INSTITUT
E\n\nQuantum-Nano Centre\, 200 University Ave West\, Room QNC 0101 Waterlo
o\,\nON CA N2L 3G1\n\n Quantum metrology studies estimation of unknown pa
rameters in\nquantum systems. The Heisenberg limit of estimation precision
1/N\,\nwith N being the number of probes\, is the ultimate sensing limit\
nallowed by quantum mechanics that quadratically outperforms the\nclassica
lly-achievable standard quantum limit 1/√N. The Heisenberg\nlimit is att
ainable using multi-probe entanglement in the ideal\,\nnoiseless case. How
ever\, in presence of noise\, many quantum systems\nonly allow a constant
factor of improvement over the standard quantum\nlimit. To elucidate the n
oise effect in quantum metrology\, we prove a\nnecessary and sufficient co
ndition for achieving the Heisenberg limit\nusing quantum controls. We sho
w that when the condition is satisfied\,\nthere exist quantum error correc
tion protocols to achieve the\nHeisenberg limit\; when the condition is vi
olated\, no quantum controls\ncan break the standard quantum limit (althou
gh quantum error\ncorrection can be used to maximize the constant-factor i
mprovement).\nWe will also discuss the modified sensing limits when only r
estricted\ntypes of quantum controls can be applied. \n
DTSTAMP:20240518T040306Z
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